Biomechanics Commons^™

Changes In Co-Activation And Lower Limb Stiffness During Prolonged Load Carriage, Matthew V. Robinett

Boise State University Theses and Dissertations

Introduction: Overuse musculoskeletal injuries are a common, costly challenge for the armed services. A stiffer lower limb during routine prolonged load carriage tasks may be necessary to attenuate elevated ground reaction forces but further increases musculoskeletal overuse injury risk. Quantifying leg and joint stiffness provides comprehensive and joint level insight into the attenuation of ground reaction forces, and subsequent injury risk. But, it is currently unknown how prolonged load carriage affects leg, knee and ankle stiffness, and knee and ankle muscular activation. Purpose: This study sought to quantify leg, knee, and ankle stiffness, and the activation and coordination of associated …

Determining The Barriers To The Use Of Post-Match Fatigue Monitoring In The Rugby Codes: A Concept Mapping Study., Mitch Naughton, Tannath Scott, Dan Weaving, Scott Mclean, Colin Solomon

Topics in Exercise Science and Kinesiology

Topics in Exercise Science and Kinesiology Volume 5: Issue 1, Article 3, 2024. The rugby codes (i.e., rugby union, rugby league, rugby sevens [termed ‘rugby’]) are team-sports that impose complex physical demands upon players which in-turn, leads to domain-specific fatigue (e.g., neuromuscular, cardio-autonomic). Quantifying post-match fatigue through various methods and metrics is important to monitor player fatigue status, which influences training readiness. The specific and general barriers limiting the use of post-match fatigue monitoring in rugby are not presently known. Therefore, the aims of this study were to identify specific and general barriers (clusters of specific barriers) to the use …

Using Inertial Measurement Units (Imus) To Assess Fatigue-Related Changes In Running: Applications In Training Load Management, Reiley Thomas Bergin

Theses and Dissertations--Rehabilitation Sciences

The inertial measurement unit (IMU) is the most researched wearable technology in running. Yet, few studies have validated IMU-derived measures against accepted laboratory standards, such as three-dimensional (3D) motion capture and force plates. IMUs have the potential to provide information that can guide training load management decisions; however, no study has explored their capability to assess fatigue-related changes in running across consecutive days of training. Therefore, the purpose of this project was to evaluate the validity and reliability of IMU-derived measures and assess their capability for detecting fatigue-related changes in running in the days following an intensified training bout. The …

Exploration Of Warm-Up Protocols On Muscular Fatigue, Sahil Kapadia

Honors Undergraduate Theses

Muscular dystrophy is a genetically linked myopathy with no cure available. The lack of a cure makes early detection and treatment of muscular dystrophy imperative. When reviewing protocols examining muscular fatigue at submaximal isometric contractions, proper warm-up appeared to be absent and could have caused skewed results and conclusions. This study examines the effects of implementing a warm-up protocol before fatiguing trials. In this study, 10 adult subjects conducted fatiguing protocols with the right rectus at submaximal isometric contractions. The warm-up period included a light walk along with contractions at 20% and 33% of maximal voluntary isometric contraction (MVIC) levels. …

Long-Term Disability Following A Hamstring Injury, Savannah Mclain

College of Graduate Studies: Theses & Dissertations

PURPOSE: Injuries to the hamstring complex are one of the most commonly seen lower extremity injuries in athletic populations. It is currently unknown how psychological or sociological factors affect an athlete after the recovery process has ended and if these factors play a role in re-injury rates relating to the hamstring. It is also unknown if athlete confidence level changes while in a fatigued state after an athlete returns to play from a hamstring injury. METHODS: Twenty-six physically active adults with and without a previous hamstring injury were recruited for this study. Participants completed a Qualtrics survey that …

Correlation Between Playertek Performance Data And Fatigue As Measured By The Restq-76 Sport Over The Course Of A Collegiate Soccer Season, Miranda Haas, Hailey Bauer, Victoria Nye, Danielle Kilboy, Shelley Payne

Journal of Sports Medicine and Allied Health Sciences: Official Journal of the Ohio Athletic Trainers Association

Please enjoy Volume 6, Issue 1 of the JSMAHS. In this issue, you will find Professional, Graduate, and Undergraduate research abstracts, and case reports.

Thank you for viewing this 6^th Annual OATA Special Edition.

Footstrike Patterns Of High And Mid-Mileage Non-Rearfoot Runners During An Exhaustive Run, Jan Urbaczka, Julia F. Silvernail, Daniel Jandacka

Kinesiology and Nutrition Sciences Faculty Research

The purpose of this study was to identify the effect of fatigue on footstrike patterns in two groups of habitually non-rearfoot runners. Twenty-eight runners participating in this study were divided into two groups by their weekly mileage. Participants completed a VO2max test to determine the velocity for the fatiguing run. Kinematic, physiological and biochemical data from the beginning and the remaining 3 minutes of fatiguing treadmill run were obtained. The overall time for fatiguing run exceeded 40 minutes (t = 48,1 ± 3,6 min.). The foot angle at the instant of initial contact significantly changed in both groups following fatigue. …

An Electromyography Study Of Muscular Endurance During The Posterior Shoulder Endurance Test, Neil A. Evans, Emily Dressler, Timothy L. Uhl

Physical Therapy Faculty Publications

The primary purpose was to determine if there is a difference between the median frequency slopes of 5 posterior shoulder muscles during the initial portion of the Posterior Shoulder Endurance Test (PSET) at the 90° and 135° shoulder abduction positions. Fifty-five healthy volunteers (31 females) participated. The median frequency of the posterior deltoid (PD), upper trapezius (UT), middle trapezius (MT), lower trapezius (LT), and infraspinatus (INF) was measured during the PSET at 90° and 135° of shoulder abduction. External torque of 13 ± 1 Nm was used for females and 21 ± 1 Nm for males. A fixed effect multi-variable …

The Influence Of Hip Mobility And Fatigue On Spinal Flexion And Muscle Activation In Rugby Scrum Performance, Joshua D. Clayton

Theses and Dissertations (Comprehensive)

Introduction: Rugby scrumming is a means of restarting play following a minor rule infringement that can occur up to 28 times per game. The scrum poses a significant injury risk, with more days missed due to injury per event than any other rugby activity. Rugby players also have a significantly higher rate of spine injury than the general population, perhaps due to flexion in combination with high compression forces, which has been cited as the main mechanism of injury. Flexion of the spine has also been associated with poor hip mobility and quadriceps fatigue in other athletic tasks and may …

Lower Extremity Biomechanics In Individuals With And Without Previous Hamstring Injury, Jessica A. Mutchler

Human Movement Studies & Special Education Theses & Dissertations

Primary risk factors for hamstrings strains such as fatigue, previous injury and strength deficits have been identified in the research, yet re-injury rates remain high among the physically active. Sub-acute analysis of the hip, knee and ankle biomechanics following a hamstrings strain have been largely overlooked and may provide additional insight into re-injury risks. It was the aim of this dissertation to explore long-term adaptations in walking and running tasks following a hamstrings strain, and to develop a hip endurance test that could be used in future studies.

Project one used a cross-sectional study with test-retest design to develop and …

Endurance Markers Are Related With Local Neuromuscular Response For The Intact But Not For The Acl Reconstructed Leg During High Intensity Running, Kostas Patras, Giorgos Ziogas, Stavros Ristanis, Elias Tsepis, Vasilis Tsiaras, Nikolaos Stergiou, Anastasios D. Georgoulis

Journal Articles

AIM: It has been demonstrated that the local neuromuscular response during high intensity exercise has a strong relationship with endurance markers. However, a diminished neuromuscular response has been reported for the operated leg in athletes having undergone anterior cruciate ligament reconstruction (ACLR). The purpose of the present study was to examine the relationships between endurance markers and the EMG response during high intensity running in ACLR athletes. METHODS: Fourteen ACLR soccer players underwent a GXT test to volitional exhaustion and a 10-min bout of high intensity running. During the 10-min bout, EMG data were recorded at the 3rd …

Elliptical Exercise Improves Fatigue Ratings And Quality Of Life In Patients With Multiple Sclerosis, Jessie M. Huisinga, Mary Filipi, Nikolaos Stergiou

Journal Articles

Fatigue, reduced quality of life (QOL), and lower physical activity levels are commonly reported in patients with multiple sclerosis (MS). This study evaluated the effects of elliptical exercise on fatigue and QOL reports in patients with MS. Patients with MS (n = 26) completed the Fatigue Severity Scale (FSS), the Modified Fatigue Impact Scale (MFIS), and the Medical Outcomes Study 36-Item Short Form Health Survey (SF-36) before and after completing 15 elliptical exercise training sessions. Changes in fatigue and QOL were assessed based on any changes in the fatigue and SF-36 questionnaires, and correlations between changes in each of the …

Electromechanical Delay Of The Knee Flexor Muscles After Harvesting The Hamstrings For Anterior Cruciate Ligament Reconstruction, Stavros Ristanis, Elias Tsepis, Dimitrios Giotis, Franceska Zampeli, Nikolaos Stergiou, Anastasios D. Georgoulis

Journal Articles

Objective: To investigate if harvesting of semitendinosus (ST) and gracilis for anterior cruciate ligament (ACL) reconstruction will have an effect in coordinative firing pattern of the hamstrings under fatigue. We hypothesized that fatigue will increase the electromechanical delay (EMD) of the hamstrings on the harvested site and impair the synchronization between the medial and lateral hamstrings, in terms of muscle activity onsets.

Design: Prospective nonrandomized study. Setting: Institutional. Patients: Twelve ACL reconstructed patients with hamstrings, 2 years postoperatively.

Interventions: The patients performed a fatigue protocol with 25 continuous maximal isometric voluntary contractions of 8-second duration with 2-second …

High Intensity Running Results In An Impaired Neuromuscular Response In Acl Reconstructed Individuals, Kostas Patras, Giorgos Ziogas, Stavros Ristanis, Elias Tsepis, Nikolaos Stergiou, Anastasios D. Georgoulis

Journal Articles

Anterior cruciate ligament (ACL) reconstruction reestablishes electromyographic activity during moderate activities such as walking but is unclear if this is also the case in sports activities such as high intensity running that results in accumulation of metabolic fatigue. Nine bone-patella tendon-bone ACL reconstructed athletes were evaluated 19.2 (5.7) months post-operatively using a telemetric electromyographic system. The neuromuscular response of vastus lateralis and biceps femoris muscles was tested bilaterally on separate occasions during 10 min running at moderate intensity (20% below the lactate threshold) and 10 min running at high intensity (40% above the lactate threshold). During moderate intensity running, electromyographic …

Muscle Vibration's Effect On The Threshold Frequency Of An Electrically Induced Muscle Cramp, Joshua D. Williamson

All-Inclusive List of Electronic Theses and Dissertations

Objective: The purpose of this study was to evaluate the effect of muscle vibration on the threshold frequency of an electrically-induced muscle cramp of the flexor hallucis brevis. Design and setting: This study used a 2 x 2 factorial design study. The independent variables consisted of treatment ( control and vibration) and time (pretest and post-test). The dependent variable was the threshold frequency of an electrically induced muscle cramp. Subjects: 16 healthy individuals, aged 21.6 ± 8.0 years, free from any lower extremity neurological, muscular, or vascular pathology were used in this study. Methods: Subjects reported on three consecutive days …